Bd VI: 4) THE ECHINOIDEA. 85 



anterior ones. — Generally there are only three large subanal tubefeet on each side, 

 whereas there are generally 4 — 5 in cavernosus : this is, however, no quite reliable 

 character either, as I find in a female specimen received from the Paris Museum 

 (one of the specimens recorded by Bernard, Op. cit, as Tripylus cavernosus) even 

 6 large subanal tubefeet. On the actinal side I do not find any character distin- 

 guishing the species from cavernosus. — The pedicellariae do not afford very reliable 

 distinguishing characters; only the tridentate differ somewhat from those of caverno- 

 sus, the larger ones being more slender and elongate than I have found them in 

 that species (PI. XIX. Fig. 47); in view of their great variability in cavernosus there 

 can not, however, be laid much stress upon this feature. The smaller ones are as 

 in cavernosus: the same holds good for the spicules. 



The colour is white on one of Loyen's types and on two specimens in hand 

 from the Hamburg Museum, but the specimen from Paris has the same brown colour 

 as cavernosus ; the white colour of the other specimens is thus evidently due to the 

 preservation. 



I have seen in all 7 specimens of this species, viz. two type specimens of Lo- 

 VEN, besides two specimens identified by LoVEN as A. cavernosas ; they came 

 from »off La Plata*; further two specimens from the Hamburg Museum, from 38 0 S. 

 56 0 W. 52 fathoms and 43° S. 6o° W. 56 fathoms, and one from the ^Expedition 

 du Cap Horn> (Baie Orange). The »Hassler-» Expedition took several specimens 

 along the Patagonian coast in 44 — 45 fathoms. It is not represented in the collec- 

 tions of the Swedish South Polar Expedition or the Fuegian Expedition. 



The species thus appears to range from the La Plata to the Southern Extremity 

 of South America; it is known with certainty from shallow water to 750 m.; the 

 large depth 750 m. is based on the »Challenger» Ech. (St. 310). Though the speci- 

 mens from this station arc recorded as ^Hemiastcr cavernosas' it may be concluded 

 that at least one of these specimens was really A. Philippii from the statement made 

 by A. AGASSIZ (p. 184) that »one of the specimens from Station 310 combines the 

 features of the two sexes in having nearly flush posterior ambulacral petals, while 

 the anterior petals are almost as deeply sunken as in well-developed females of the 

 same size-'. — That the specimens from the »Hassler» Expedition are really A. Phi- 

 lippii I think very probable, partly because AGASSIZ has had a type specimen from 

 LOVEN for comparison, partly because he expressly states that the posterior petals 

 are ^comparatively shallow*; also the figures seem to show that, though, it must be 

 conceded, the figures 4 and 6, PL IV, show the posterior petals deeper than I have 

 seen them in any of the specimens examined by me; but evidently they are con- 

 siderably less deepened than the anterior ones, which distinguishes them from caver- 

 nosus. 



